DE19647264A1 - Guide for railway vehicle with rubber tyres - Google Patents

Abstract

The guide has guide wheels, which are connected to a separate frame connected to the dolly. The frame is preferably about 8 m long. The guide wheels are preferably connected at the front and back ends of the frame. The guide wheels rest and run on the rails with the help of supplementary running wheels.

Description

In the patent application "Method for noise reduction of a train "I suggested for the Railway to introduce new rails and tires. The Tires should have a pressure of 40 bar. An inquiry with an expert from a tire company has shown that a tire with 40 bar internal pressure is conceivable is. A normal car tire today would be the first tear at a pressure of 20 bar.

The rolling resistance is reduced by the high pressure. The rolling resistance is probably hardly higher than at a today's railway bike.

task

A suitable guide for the train is to be constructed will.

The following requirements must be met by the management:

1) It should make as little noise as possible.

2) The train should be stable (good suspension, high so-called smoothness).

3) It should wear out as little as possible.

4) The costs must be kept within limits.

solution

If you wanted the guide wheels directly on the bogie frame attach, so they would the spring movements of the Join the bogie frame. this is not Well.

It is best to have all the guide wheels together in one Attach frame. This frame has additional ones Wheels with which he runs on the rails. The The bogie is on both ends, i.e. close to the front axle and near the rear axle, springy connected to the frame.

To reduce the noise of the guide, are used for the wheels rubber tires also used. The tires should be as possible have a large diameter.  

It would be best if you were to introduce a new one Systems also immediately increased the track width. A track width of 2.40 meters would be suitable. Maybe you want that leave the old track width first, so that the old trains too can drive on the same new tracks.

In this case, the guide wheels on the left and right rail, at most about Be 40 cm tall. There has to be a switch for the train be constructed.

Rubber tires are also used for the wheels of the guide frame with a diameter of 40 cm.

The guide wheels have the dimensions (diameter × width) 40 cm × 10 cm, the wheels 40 cm × 20 cm with 20 cm wide rails.

advantages

In the construction- all guide wheels are, so both the right wheel guide wheels as well Left rail guide wheels, together on one Frame attached. This ensures that the Guide wheels very exactly perpendicular to the contact surface of the Stand rail. The frame on both sides on the Rails lies more precisely in the horizontal held. The smoothness is increased and the wear reduced.

The frame is about 8 meters long. At the front end and the guide rollers are at the rear end. By the relatively large length of the frame is guaranteed that the frame is very exactly parallel to the rails. It runs smoothly. The distance between the points on which the bogie frame resiliently with the Lead frame is connected, should also be as large as possible be.

The frame has its own wheels. This will make it natural ensures that the movement of the guide wheels in the vertical direction is very low.

The connection of the guide frame with the bogie frame should be in a very low position, max 20 cm above the Top edge of the rail. This will ensures that the frame by the lateral force is not tipped out of the rails.  

From the train, no weight is needed on the frame to be transferred. The weight of the frame is sufficient out. If for the frame, which has the dimensions 8 m × 1.4 m (or 8 m × 2.4 m with new track width), stable Double-t beam, 40 cm high, 20 cm wide, 2 cm wall thickness, used, a frame weighs 2.5 t. On the Impellers, in the construction according to the enclosed Drawing 8 pieces, only this 2.5 t. So that small wheels should not wear out as quickly not too much weight on the wheels lie.

Other options for constructing a guide could look as follows (perhaps initially more obvious options):
The guide wheels are somehow connected to the axles of the bogie. In this way, the guide wheels do not follow the resilient movement of the bogie frame.

Or it will be at the 4 ends of the bogie separately attached guide elements that several Guide wheels and also have impellers on the Run rail. The connection with the bogie must be springy.

The constructions mentioned have one Construction with a large frame disadvantages.  

power consumption

The rolling friction coefficient of a car tire is approximately r = 0. 02. This means that the car is at 2% gradient just rolling down the mountain by itself.

The railroad wheel has lower rolling friction, r = 0.002.

The train already rolls at 2 per mille Down the mountain.

It is noteworthy that in today's truck already r is much lower than in a car, r = 0.006 to 0.01.

There seems to be a connection between the internal pressure of the To give tire p and rolling friction r.

Automobile:
p = 2 bar, r = 0.02.

Truck:
p = 6 bar to 8 bar, r = 0.006 to 0.01.

A tire with an internal pressure of p = 40 bar is estimated to have comparatively low number of rolling friction as today Railway wheel.

Let p = 40 bar, width of the rails = 20 cm, Axle load = 16 t.

The contact area of a tire is 10 cm × 20 cm.

A locomotive weighs up to 80 t with 4 axles, the wagons weigh only 40 t. Accordingly, the Support area for the locomotive 12 cm × 20 cm, for the cars 6 cm x 20 cm.

The energy consumption due to rolling friction is calculated
E = r × m × g × s.
r = rolling friction number.
m = mass.
g = gravitational acceleration
s = path.

Let r = 0.002 not depend on the speed.

The energy consumption is 0.6 kwh per t per 100 km.

The ICE consumes 2,000 kwh / 100 km with a weight of 800 t.
E = 2.5 kwh / t.
Energy consumption of guiding the train with rubber tires:

25% of energy consumption is accounted for by Rolling friction.

Energy consumption when running the train with rubber tires:  

A tour weighs 2.5 t. 2 guides weigh 5 t. Of the entire car weighs 50 t.

With the large rubber tires with p = 40 bar it may be r = 0.002 achievable.

The small tires on the guide have a much higher rolling friction coefficient. p = 4 bar to 8 bar.
Let r = 0.008.
E = 2.5 kwh / t.

Converted to the weight of the whole car E = 0. 25 kwh / t.

The train's energy consumption may increase through the leadership by 10%.

It should be m. E. less energy consumption Rolling friction saved rather than in air resistance will.

The power required to overcome the air resistance is calculated
P = 0.5 × d × cw × A × v ³ .
d = density of air
cw = cw value
A = front surface
v = speed.

The v ³ relationship is remarkable. p proportional to v ³ , so the energy consumption per 100 km is proportional to v ² .

At 200 km / h the energy consumption is 4 times as high as at 100 km / h.

The ICE 2.2 is motorized with 20 kw / t.

adoption

At 300 km / h are used to overcome air resistance 12 kw / t needed. The energy consumption alone the air resistance is 4 kwh / t.

Today's ICE

Total energy consumption 2.5 kwh / t (40% fast driving share).

The Transrapid should drive 450 km / h. The energy consumption due to air friction is 10 kwh / t.

Claims (1)

Guide for a railroad train, characterized in that the guide wheels are attached to a separate frame which rests on the rails with the aid of additional running wheels.